According to the International Union of Pure and Applied Chemistry (IUPAC) definition, pores with a pore size of less than 2 nm are called micropores; pores with a pore size between 2 and 50 nm are called mesopores; pores with a pore size of more than 50 nm are called macropores. 
Note: For materials with special requirements for the pore size of the 0.35-0.53nm section in the micropore section, the analytical instrument must have three conditions at the same time:
a. Equipped with turbo molecular pump (to increase initial vacuum);
b. Non-mechanical strain type high vacuum pressure test devices for ionizing high vacuum pressure test (improving high vacuum pressure test accuracy. All sensors such as diffused silicon, capacitive, etc. that use mechanical strain as the signal source for 100,000 One part P / P0, that is, the pressure below 1Pa absolute pressure is not applicable);
c. Super-large-diameter pipeline (shorten the pumping time to reach high vacuum and increase the pumping rate, otherwise the molecular pump is invalid);
The three conditions are indispensable, otherwise the pore volume of the segment can only be measured, but the specific distribution state cannot be obtained.
The above data is calculated by the Kelvin equation
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